Sound cannot travel through space
Sound cannot travel in the vacuum of space because there are no molecules for sound waves to vibrate through, making conversations and explosions completely silent.
Ever wonder why space is silent in movies? Sound waves need molecules to vibrate through, and space is a near-perfect vacuum. With only about one atom per cubic centimeter, conversations, explosions, and screams are completely silent. This is a stark contrast to Earth's atmosphere, which has 10^19 molecules per cubic centimeter.
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